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<p>In the present work, Cu<sub>0.72</sub>Co<sub>2.28</sub>O<sub>4</sub>–CuO/HMS nanocomposite was efficiently synthesized by a novel, facile, simple and eco-friendly impregnation method followed by calcination at 550&#xa0;°C. The Fourier transform infrared spectroscopy and X-ray diffraction results established the formation of the nanocomposite Cu<sub>0.72</sub>Co<sub>2.28</sub>O<sub>4</sub>–CuO/HMS. The catalytic reduction of 4-NP to 4-AP in the presence of excess NaBH<sub>4</sub> as a reducing agent in aqueous media, was selected as a reaction model to evaluate the catalytic activity of Cu<sub>0.72</sub>Co<sub>2.28</sub>O<sub>4</sub>–CuO/HMS nanocomposite in the ambient. The Cu<sub>0.72</sub>Co<sub>2.28</sub>O<sub>4</sub>–CuO/HMS material exhibited robust catalytic activity in 4-NP reduction with a rate constant of <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11164_2025_5703_Article_IEq1.gif" Format="GIF" Height="18" Rendition="HTML" Resolution="72" Type="Linedraw" Width="110" /> </InlineMediaObject> <EquationSource Format="TEX">\(2.04 \times {10}^{-2}{\text{ s}}^{-1}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mn>2.04</mn> <mo>×</mo> <msup> <mrow> <mn>10</mn> </mrow> <mrow> <mo>-</mo> <mn>2</mn> </mrow> </msup> <msup> <mrow> <mspace width="0.333333em" /> <mtext>s</mtext> </mrow> <mrow> <mo>-</mo> <mn>1</mn> </mrow> </msup> </mrow> </math></EquationSource> </InlineEquation>. A 4-NP conversion percentage which is of 100% was achieved within 90 s on the nanocomposite. The kinetic analysis confirmed the Langmuir–Hinshelwood model for the Cu<sub>0.72</sub>Co<sub>2.28</sub>O<sub>4</sub>–CuO/HMS material catalyzed 4-NP reduction.</p>

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Facile synthesis of Cu0.72Co2.28O4–CuO composite nanoparticles grown on HMS sieves: characterization and catalytic evaluation in the reduction of 4-NP

  • 期刊论文

  • 发表日期：

    2025年8月3日

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  • Ouardia Zekri,
  • Thiziri Djelloudi,
  • Sarra Karoui,
  • Franck Launay

摘要

In the present work, Cu0.72Co2.28O4–CuO/HMS nanocomposite was efficiently synthesized by a novel, facile, simple and eco-friendly impregnation method followed by calcination at 550 °C. The Fourier transform infrared spectroscopy and X-ray diffraction results established the formation of the nanocomposite Cu0.72Co2.28O4–CuO/HMS. The catalytic reduction of 4-NP to 4-AP in the presence of excess NaBH4 as a reducing agent in aqueous media, was selected as a reaction model to evaluate the catalytic activity of Cu0.72Co2.28O4–CuO/HMS nanocomposite in the ambient. The Cu0.72Co2.28O4–CuO/HMS material exhibited robust catalytic activity in 4-NP reduction with a rate constant of \(2.04 \times {10}^{-2}{\text{ s}}^{-1}\) 2.04 × 10 - 2 s - 1 . A 4-NP conversion percentage which is of 100% was achieved within 90 s on the nanocomposite. The kinetic analysis confirmed the Langmuir–Hinshelwood model for the Cu0.72Co2.28O4–CuO/HMS material catalyzed 4-NP reduction.